21116157006638 has 8 divisors (see below), whose sum is σ = 31679035383600. Its totient is φ = 10556478545440.

The previous prime is 21116157006533. The next prime is 21116157006661. The reversal of 21116157006638 is 83660075161112.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 21116157006592 and 21116157006601.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 799962443 + ... + 799988838.

It is an arithmetic number, because the mean of its divisors is an integer number (3959879422950).

Almost surely, 2^{21116157006638} is an apocalyptic number.

21116157006638 is a deficient number, since it is larger than the sum of its proper divisors (10562878376962).

21116157006638 is a wasteful number, since it uses less digits than its factorization.

21116157006638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1599957882.

The product of its (nonzero) digits is 362880, while the sum is 47.

The spelling of 21116157006638 in words is "twenty-one trillion, one hundred sixteen billion, one hundred fifty-seven million, six thousand, six hundred thirty-eight".